Just finished this little article that explains how the various types of bits work.
Controversial as it is, how bits work isn’t rocket science. Read more about it:
November 4, 2011
Snaffle Bits Understanding who bits work isn’t that difficult, once you know how each type of bit works and how each bit mechanically operates. That said, a given bit is not meant to be a correction for how the horse obtains the proper frame for any given discipline. Using a ‘stronger’ bit as a solution is not a solution to ‘holes’ in a horse’s training. In fact, sometimes using ‘less’ bit is the solution in that instance.
The reality is, and this is a conclusion I often get much criticism for, that most horses go just fine in a simple snaffle, curb bit, a bitless bridle or, if your discipline requires, a double bridle provided that the horse has been brought along in a rational and progressive program of training.
Nevertheless, sometimes a certain bitting scheme is required to bring a horse along in its training. Understanding how these bits work, how the forces each bit exerts and to what degree they exert those forces, along with an understanding of a particular horse and how that horse responds is required. (read more)